Display Apparatus to Control Display Form of Virtual Object

1. A display control apparatus, comprising: processing circuitry configured to control a display to display a virtual object at a first position in a first display area of a transparent medium, wherein the virtual object corresponds to a real object external to and in front of the display control apparatus, and the real object is viewable by a viewer of the display through a second display area of the transparent medium different from and not overlapping the first display area; and control the display to display the virtual object moving, at a constant speed irrespective of a speed of the real object, from the first position to a second position in the first display area, wherein the first position is at a border of the first display area, the second position is a distance toward a center of the first display area and away from the border, the processing circuitry determines a display form of the virtual object according to a distance between the virtual object and the border of the display area, the processing circuitry controls the display to display the virtual object according to the determined display form, and the processing circuitry controls the display to display the virtual object at the second position to be more perceptible than the virtual object displayed at the first position to the viewer of the display.

2. The display control apparatus according to claim 1 , wherein the processing circuitry controls the display to display the virtual object at the first position to have a first transparency, and the processing circuitry controls the display to display the virtual object at the second position to have a second transparency that is less than the first transparency.

3. The display control apparatus according to claim 1 , wherein the processing circuitry is configured to control the display to display the virtual object at positions in the first display area corresponding to movement of the real object.

4. The display control apparatus according to claim 1 , wherein the processing circuitry is configured to control the display to display the virtual object at positions in the first display area corresponding to position information of the real object.

5. The display control apparatus according to claim 1 , wherein the processing circuitry is further configured to control the display to display the virtual object at a third position in the first display area, the second position is closer to the border than the third position is to the border, and the processing circuitry controls the display to display the virtual object at the third position to be more perceptible than the virtual object displayed at the second position to the viewer.

6. The display control apparatus according to claim 5 , wherein a line intersects the first position, the second position and the third position.

7. The display control apparatus according to claim 1 , wherein the display is a head-up display (HUD) that projects light to a surface of the transparent medium to form the virtual image.

8. The display control apparatus according to claim 7 , the transparent medium is a windshield of a vehicle.

9. A display control system, comprising: the display control apparatus of claim 1 ; and the display.

10. A head-up display (HUD) device, comprising: the display control apparatus of claim 1 ; and the display, wherein the display is configured to project light to a surface of the transparent medium to form the virtual image.

11. A display control method, comprising: controlling, by processing circuitry of a display control apparatus, a display to display a virtual object at a first position in a first display area of a transparent medium, wherein the virtual object corresponds to a real object external to and in front of the display control apparatus, and the real object is viewable by a viewer of the display through a second display area of the transparent medium different from and not overlapping the first display area; controlling the display to display the virtual object moving, at a constant speed irrespective of a speed of the real object, from the first position to a second position in the first display area; and determining a display form of the virtual object according to a distance between the virtual object and a border of the display area, wherein the first position is at the border of the first display area, the second position is a distance toward a center of the of the first display area and away from the border, the display is controlled to display the virtual object according to the determined display form, and the display is controlled to display the virtual object at the second position to be more perceptible than the virtual object displayed at the first position to the viewer of the display.

12. The display control method according to claim 10 , wherein the display is controlled to display the virtual object at the first position to have a first transparency, and the display is controlled to display the virtual object at the second position to have a second transparency that is less than the first transparency.

13. The display control method according to claim 10 , wherein the display is controlled to display the virtual object at positions in the first display area corresponding to movement of the real object.

14. The display control method according to claim 10 , wherein the display is controlled to display the virtual object at positions in the first display area corresponding to position information of the real object.

15. The display control method according to claim 10 , wherein the display is controlled to display the virtual object to move within the first display area.

16. A non-transitory computer readable recording medium storing a display control program which, when executed by circuitry of a computer, causes the computer to: control a display to display a virtual object at a first position in a first display area of a transparent medium, wherein the virtual object corresponds to a real object external to and in front of the computer, and the real object is viewable by a viewer of the display through a second display area of the transparent medium different from and not overlapping the first display area; control the display to display the virtual object moving, at a constant speed irrespective of a speed of the real object, from the first position to a second position in the first display area; and determine a display form of the virtual object according to a distance between the virtual object and a border of the display area, wherein the first position is at the border of the first display area, the second position is a distance toward a center of the first display area and away from the border, the display is controlled to display the virtual object according to the determined display form, and the display is controlled to display the virtual object at the second position to be more perceptible than the virtual object displayed at the first position to the viewer of the display.